Hemp can do a remarkable number of things: replace cotton, substitute for wood, insulate buildings, and absorb more carbon per acre than forests. Yet it remains a niche crop, making up a global market of just $7.27 billion in 2025. The reasons come down to a tangled mix of legal history, missing infrastructure, regulatory risk, and building codes that are only now catching up.
Decades of Prohibition Gutted the Industry
The simplest explanation for hemp’s underuse is that the United States effectively banned it for the better part of a century. After the Marihuana Tax Act of 1937, U.S. hemp acreage shrank rapidly and eventually disappeared entirely. Because hemp and marijuana are both varieties of cannabis, hemp got swept into the same legal category, and an entire supply chain, from seed breeders to fiber processors, dissolved over the following decades.
The 2018 Farm Bill finally legalized hemp at the federal level, defining it as cannabis with 0.3% THC or less by dry weight. But legalizing a crop doesn’t instantly rebuild the farms, factories, and expertise that vanished over 80 years. Most other commodity crops have had continuous investment in breeding, harvesting technology, and processing infrastructure throughout that same period. Hemp is essentially starting over.
The 0.3% THC Rule Creates Real Risk
That 0.3% THC threshold isn’t just a technicality. If a farmer’s hemp crop tests above it, even slightly, the entire harvest is reclassified as a controlled substance. The plants must be destroyed on-site using disposal methods approved by the USDA. The farmer absorbs the full cost of growing and then destroying the crop, with no compensation.
THC levels in hemp can fluctuate based on genetics, weather, soil conditions, and harvest timing, factors that are difficult to control precisely. This means a farmer can do everything right and still lose an entire season’s work. States and tribal authorities must report every instance of non-compliant plants to the USDA monthly, adding regulatory pressure at every level. For many farmers, the financial risk of entering the hemp market simply isn’t worth it compared to growing established crops like corn or soybeans, where there’s no chance of your harvest being confiscated.
Processing Infrastructure Barely Exists
Even when hemp is grown successfully, there’s often nowhere nearby to process it. Hemp stalks need to go through decortication, a process that separates the tough outer fiber from the softer inner core (called hurd). Both parts are useful, but they have to be split apart before they can become textiles, insulation, or building materials.
The equipment to do this is expensive and hard to find. A single small-scale decorticator costs around $229,000, and only a handful of companies worldwide manufacture them. Specialized harvesting equipment can run close to $500,000. According to an analysis from Ohio State University, facility costs account for 63% of total hemp fiber processing expenses, with labor adding another 36%. The equipment market is still in its infancy, which keeps prices high and options limited.
Compare this to cotton or timber. Those industries have massive, well-distributed processing networks built up over centuries. A cotton farmer can deliver bales to a gin within a short drive. A hemp farmer may have no processing facility in their state at all. This bottleneck means that even willing growers can’t get their product to market efficiently.
Hemp Outperforms Cotton but Can’t Compete on Price
On paper, hemp looks like a superior fiber crop. It requires 38% less water overall than cotton, has a 60% lower water footprint, needs 84% less irrigation, and has a 91% lower irrigated water footprint. Hemp also grows densely, produces usable fiber in about four months, and generally needs fewer pesticides than cotton.
None of that matters if the end product costs more. Cotton benefits from enormous economies of scale, government subsidies in many countries, and a global supply chain optimized over generations. Hemp fiber, processed through expensive, small-scale equipment with limited throughput (roughly 1,000 pounds per hour on a small decorticator), simply can’t match cotton’s price point yet. Until processing scales up significantly, hemp textiles and industrial fiber will remain premium products rather than commodity replacements.
Building Codes Are Just Now Opening the Door
Hempcrete, a mixture of hemp hurd and lime, is a promising building material. It insulates well, regulates moisture, resists mold, and is carbon-negative. But for most of hemp’s legal history in the U.S., there was no recognized way to use it in residential construction because building codes didn’t address it.
That’s changing, but slowly. Hemp-lime construction was first approved for inclusion in the 2024 International Residential Code as Appendix BL. In late 2024, the code committee unanimously approved updates for the 2027 version that include fire-rated hempcrete wall assemblies for the first time, based on standardized one-hour fire tests. A few jurisdictions, including Austin, Texas, and the state of Minnesota, have already adopted the appendix for their 2026 residential codes.
The catch: adopting appendices is voluntary. In most of the country, hempcrete still has no clear path through the permitting process. Builders can propose it to local building officials on a project-by-project basis, but that adds time, cost, and uncertainty. Most contractors and homeowners won’t take that on when conventional materials are readily available and code-compliant everywhere.
The Carbon Argument Is Strong but Undervalued
One hectare of industrial hemp (about 2.5 acres) can absorb up to 22 tonnes of CO2 in a single growing season, more per hectare than any forest or commercial crop. Even conservative UK estimates put the figure at 7.5 to 11.25 tonnes per hectare from the stem alone. And when hemp is turned into building materials or durable goods, that carbon stays locked away rather than returning to the atmosphere.
Despite this, hemp doesn’t yet fit neatly into most carbon credit or carbon farming programs. Without standardized protocols for measuring and certifying hemp’s carbon capture, farmers can’t easily monetize this benefit. If carbon markets eventually create a reliable revenue stream for hemp growers, it could change the economics significantly. But right now, the environmental case for hemp doesn’t translate into dollars on a farm balance sheet.
The Market Is Growing, but From a Small Base
The global industrial hemp market is projected to grow from $7.27 billion in 2025 to $21.23 billion by 2034, a compound annual growth rate of about 12.7%. That’s healthy growth, driven by demand for sustainable textiles, CBD products, and bio-based materials. But for context, the global cotton market alone is worth over $40 billion, and the timber industry exceeds $600 billion. Hemp is growing fast in percentage terms while remaining a small fraction of the industries it could theoretically disrupt.
The core problem is circular: hemp won’t get cheaper until there’s more processing infrastructure, but nobody wants to invest in processing infrastructure until there’s a reliable, large-scale supply of hemp. Farmers won’t commit acreage without guaranteed buyers and nearby processors. Manufacturers won’t retool supply chains for a material that’s inconsistently available. Breaking this cycle requires coordinated investment across farming, processing, and manufacturing, something that’s happening, but gradually.